<?php

/*
 * Copyright 2008 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#namespace tehframework\filtering;

#use \Countable;

class FilterChain implements Filter, Countable
{
	private $filters = array();
	
	/**
	 * @param  Filter[] $filters
	 */
	public function __construct(array $filters = null)
	{
		if (!empty($filters))
		{
			foreach ($filters as $filter)
			{
				$this->registerFilter($filter);
			}
		}
	}
	
	/**
	 * @return int
	 */
	public function count()
	{
		return count($this->filters);
	}
	
	/**
	 * @param  Filter $filter
	 * @return FilterChain
	 */
	public function registerFilter(Filter $filter)
	{
		$this->filters[] = $filter;
		
		return $this;
	}
	
	public function filterValue($rawValue)
	{
		$filteredValue = $rawValue;
		
		foreach ($this->filters as $filter)
		{
			$filteredValue = $filter->filterValue($filteredValue);
		}
		
		return $filteredValue;
	}
}